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[Official] AMD Radeon HD 7950/7970/7990 Owners Thread - Page 793

post #7921 of 38737
Guys the memory on some of these cards can't OC nearly as well as other cards can. It varies even more than core clocks do. Always overclock your core first and find the maximum value you can attain with your core, and THEN OC the memory.
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post #7922 of 38737
Quote:
Originally Posted by svthomas View Post

If you are using afterburner, do you have your GPU type set with the proper voltage when you go to settings? What is your ASIC percentage?
This should give you an idea about the GPU type and the voltages each should be set at.
up to 2F90 (up to 75% quality) - 1.1750V
up to 34D0 (up to 80% quality) - 1.1125V
up to 3820 (up to 85% quality) - 1.0500V
up to 3A90 (up to 90% quality) - 1.0250V

Interesting... where do these numbers come from?
post #7923 of 38737
Quote:
Originally Posted by Silvaren View Post

Nothing happened with Heaven then i started to play rift and boom after 1 minute screen went black for a while then it came back and i saw this things again with oc settings.
476
What is wrong ? What do i need to do ?
vcore: 1231
core clock: 1150
memory clock: 1520
Power Limit : +20%

Heaven is no good to test for OC stability. It really is NOT. And stuff like 3dmark is not good either. It just doesnt push your card enough in my opinion.
Use real games to test or short minutes of occt (10 minutes max).
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post #7924 of 38737
Okay so I'm on 8.95.5 now, after furiously not wanting to.

Same performance as 12.3 WHQL's. Same MLAA problems. Same idle lock up. Still can't play GTA IV maxed out, while my GTX 580 could.
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post #7925 of 38737
Quote:
Originally Posted by stinart View Post

For all with o/c problems : watch your temps ! For picky chips even 70c is enough for artifacts above 1125mhz.
Some examples from my 7970 :
  • 1125/1570 /1.13mv ok but with artifacts threshold at 75c. Above that i get slight artifacts
  • 1130/1570/1.13 ok but with artifacts threshold now at 71c.
  • 1200mhz my artifact threshold is at 58c = 100% fan
This chip is thirsty and needs water as hell biggrin.gif
As you can understand more speed= lower temp threshold for artifacts . My card is not vcore hungry at all but its very picky with temps.
So raise your fan rpm and test again
.

Are you using a fan profile in AB? If so, could I use it? My card is similar and a strong fan profile seems to work for it but wanted to see other examples.
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post #7926 of 38737
Quote:
Originally Posted by LAF View Post

Ooooh baby! They come out here today - but I need to sell my DCUII first so I have funds sad-smiley-002.gif
It's 1.5GB, according to a mate who downloaded it last night. I'm about to boot up my main rig and do it - 300kbps woohoo
I only got that artifacting with an unstable core clock.
Quote:
Originally Posted by firestorm1 View Post

try to reduce memory clock to 1500mhz.

What should i do then ? Should i reduce memory clock or should i do something about core clock/voltage.

Is there any XFX Black Edition OC 7970 user with some good stable overclock ?
post #7927 of 38737
Quote:
Originally Posted by Silvaren View Post

What should i do then ? Should i reduce memory clock or should i do something about core clock/voltage.
Is there any XFX Black Edition OC 7970 user with some good stable overclock ?

You'll have to test for your own settings, no two chips are the same. Take off your memory clock entirely, and see if you still get the issues. If so, raise voltage and see if that fixes it. If not, try putting your memory clock back on and then back it down until you don't see the error anymore.
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post #7928 of 38737
Quote:
Originally Posted by criznit View Post

Are you using a fan profile in AB? If so, could I use it? My card is similar and a strong fan profile seems to work for it but wanted to see other examples.

That depends on how much fan noise you want. i set my AB to 45% from 50c to 85c and then max of course. 45% its barely ok for 1125 because i have above 20c ambient temp
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post #7929 of 38737
Here some 3dmark results for my rig :

Game OC bench (1130mhz core @ 1175mv / 1550mhz memory @ stock voltage)

295


Bench OC bench (1200mhz core @ 1193mv / 1600mhz memory @ stock voltage)

325


Are these results what to be expected?
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Intel i5 2500k @ 4,5GHz, 1.33v Asus P8Z68-V Pro Gen3 Sapphire HD7950 OC Edition @ 1130 / 1550, 1.150v 8GB Corsair CML8GX3M2A1600C9 @ DDR3-1600, 9-9-9... 
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1x Samsung 830 Series Desktop Upgrade Kit Sony Optiarc 24x DVDRW AD-7280S Scythe Mugen 2 Rev. B 2x Front intake fans 
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1x Large intake side fan 1x Back exhaust fan Windows 7 Enterprise x64 SP1 Samsung SyncMaster 2494hm 
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post #7930 of 38737
Quote:
Originally Posted by stinart View Post

That depends on how much fan noise you want. i set my AB to 45% from 50c to 85c and then max of course. 45% its barely ok for 1125 because i have above 20c ambient temp

I play with headphones now so I don't hear the fans. I will try this setup out, thanks!
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